Phone Comparison - Vivo Y66 vs vivo Y91(Mediatek) vs Xiaomi Redmi A3x
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| Price Comparison (India) | - | - | |
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| Manufacturer | vivo | vivo | Xiaomi |
| Announced | December 2016 | January 2019 | May 2024 |
| Status | Available - December 2016 | Available - January 2019 | Available - May 2024 |
| Price | Rs. 14,990 ($216.00) [Similarly Priced] | Rs. 9,990 ($0.00) [Similarly Priced] | - |
| Colors | Gold | Starry Black, Ocean Blue | Midnight Black, Moonlight White, Aurora Green |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
153.56 x 75.79 x 7.49 mm (6.05 x 2.98 x 0.29 in) |
155.1 x 75.1 x 8.3 mm (6.11 x 2.96 x 0.33 in) |
168.4 x 76.3 x 8.3 (6.63 x 3 x 0.33) |
| Weight | 157 g (5.54 oz) | 163.5 g (5.75.0.18 oz) | - |
| SIM Type | Dual SIM Hybrid (Nano SIM + Micro SIM, or Micro SIM + microSD Card) | Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA2000 1xEV-DO |
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM only) | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 1900 / 2100 | HSDPA 850 / 900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE band 1(2100), 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) | LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 38(2600), 40(2300), 41(2500) | LTE |
| Messaging | SMS, MMS, EMail, IM | ||
| Build Features | - Metal Body - 2.5D Curved Glass |
- Fingerprint Sensor |
- Fingerprint Sensor |
| Notification LED | Yes | - | - |
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| OS | Android OS, v6.0.1 (Marshmallow) | Android 8.1 (Oreo) | Android 14 |
| User Interface | FunTouch OS 3.0 | Funtouch 4.5 | MIUI |
| Processor | Octa-core 1.4 GHz Cortex-A53, Qualcomm MSM8937 Snapdragon 430 | Octa-core 2.0 GHz Cortex-A53, Mediatek MT6762 Helio P22 (12 nm) | Octa-core, Unisoc T603 |
| GPU | Adreno 505 | PowerVR GE8320 | - |
| RAM | 3 GB | 3 GB | 3 GB |
| Internal Memory | 32 GB | 64 GB | 64 GB |
| External Memory | microSD, up to 128 GB | microSD, up to 256 GB | microSDXC (dedicated slot) |
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| Type | IPS LCD capacitive touchscreen | IPS LCD Capacitive Touchscreen | HD+ IPS LCD Screen 90Hz Refresh Rate, Corning Gorilla Glass 3 |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.5 inches | 6.22 inches | 6.71 inches |
| Resolution | 720 x 1280 pixels (267 ppi) | 720 x 1520 pixels (270 ppi) | 720 x 1650 pixels (268 ppi) |
| Screen-to-Body Ratio | 71.66% | 83.15% | 83.05% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 13 MP, 4160 x 3120 pixels | 13 MP + 2 MP | 8 MP + 0.08 MP |
| Flash | LED Flash | LED Flash | LED Flash |
| Features | AutoFocus, Geo-tagging, Touch Focus, Face/smile Detection, HDR, Panorama | 13 MP, f/2.2, PDAF 2 MP, f/2.4, depth sensor Panorama |
8 MP, f/2.0, (wide) 0.08 MP (auxiliary lens) HDR |
| Video | 1080p@30fps | 1080p@30fps | 1080p@30fps |
| Front Camera | 5 MP [Similar] | 8 MP, f/1.8 [Similar] |
5 MP, f/2.2, (wide) 1080p@30fps [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA, LTE, EV-DO Rev.A 3.1 Mbps, VoLTE | HSPA 42.2/5.76 Mbps, LTE Cat5 150/75 Mbps | HSPA, LTE |
| Bluetooth | v4.1, A2DP | 5.0, A2DP, LE | Yes |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot | Yes |
| USB | microUSB v2.0 | microUSB 2.0, USB On-The-Go | USB Type-C |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS, GLONASS, BDS | GPS, GLONASS, GALILEO, BDS |
| Browser | HTML5 | Yes | Yes |
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| Internal | 32 GB, 3 GB RAM | 64 GB, 3 GB RAM | 64 GB, 3 GB RAM eMMC5.1 |
| Expandable Storage | microSD, up to 128 GB | microSD, up to 256 GB | microSDXC (dedicated slot) |
| USB OTG | Supported | Supported | Not Supported |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| Magnetic-Field Sensor (Compass) | |
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| NFC | |
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| Type | Non-removable Li-Ion Battery | Non-removable Li-Po Battery | Non-removable Li-Po Battery Battery Charging 10W |
| Capacity | 3000 mAh | 4030 mAh | 5000 mAh |
| Stand by | - | - | - |
| Talk Time | - | - | - |
Rs. 9,990 
